package cn.itcast.netty.c1;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;

public class HelloServer {

    public static void main(String[] args) {
        // 1.启动器，负责组装netty组件，启动服务器
        new ServerBootstrap()
                // 2.添加EventLoop(selector, thread)
                .group(new NioEventLoopGroup())
                // 3.选择服务器的ServerSocketChannel实现
                .channel(NioServerSocketChannel.class)
                // 4.负责处理，能执行哪些操作
                .childHandler(
                        // 5.代表和客户端进行读写的通道初始化，负责添加别的handler
                        new ChannelInitializer<NioSocketChannel>() {
                    @Override
                    protected void initChannel(NioSocketChannel ch) throws Exception {
                        // 6.添加具体handler
                        ch.pipeline().addLast(new StringDecoder());
                        ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {  // 自定义handler
                            @Override   // 读事件
                            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                // 打印上一步转换好的字符串
                                System.out.println(msg);
                            }
                        });
                    }
                })
                // 7.绑定监听端口
                .bind(8080);
    }
}
